Several Practical Tips for Using Analytical Grade Tris Buffer

Tris buffer is one of the most frequently prepared reagents in biochemistry laboratories. Analytical grade Tris has become a daily choice for many laboratories due to its good purity and moderate price. Below are some practical experiences worth paying attention to when using analytical pure Tris buffer from several operational perspectives.

The Effect of Temperature on pH Value

Many experimenters have encountered situations where Tris buffer solution is precisely adjusted to pH 8.0 at room temperature, placed in a 4 ℃ cold storage or 37 ℃ incubator, and then measured again, only to find that the pH value has changed. This is not a configuration error, but rather the physical and chemical properties of Tris itself. The pKa value of Tris varies with temperature, and as the temperature increases, the pKa decreases and the pH of the solution decreases; When the temperature decreases, the pKa increases and the pH of the solution increases. The amplitude of this change in pure Tris is approximately 0.025 to 0.03 pH units per degree Celsius. For example, a buffer solution prepared and calibrated to pH 8.0 at 25 ℃ has an actual pH of about 8.4 at 4 ℃ and about 7.7 at 37 ℃. The solution to this problem is not complicated: calibrate the pH value at the actual temperature used in the experiment. If the experiment is conducted in a cold storage, the buffer solution should be placed in the cold storage to cool down, and the pH should be adjusted after the temperature stabilizes. After understanding this characteristic, many experimental fluctuations caused by inaccurate pH can be improved.

Tris buffer

Can pure Tris be used for RNA experiments

This question requires distinguishing the type of experiment. If only ordinary RNA agarose gel electrophoresis is used to observe the integrity of total RNA, TAE or MOPS buffer prepared by analyzing pure Tris can normally be used. But if the experiment involves high-sensitivity operations such as reverse transcription, real-time fluorescence quantitative PCR, or RNA library construction, trace amounts of RNase in the buffer may lead to RNA degradation, thereby affecting the accuracy of the results. Analysis grade Tris does not specifically remove nucleases during the production process, so for the sensitive experiments mentioned above, it is recommended to use Tris without nucleases. If the laboratory only analyzes pure Tris, it is possible to consider using DEPC treated water to prepare a buffer solution and then high-pressure sterilization to remove some RNase activity, but this cannot fully meet professional standards. Choosing the corresponding level of reagent based on the sensitivity requirements of the experiment is a relatively safe approach.

Storage and repeated use of buffer solution

Many laboratories will prepare larger volumes of Tris buffer at once, such as stock solutions with 10 times the concentration. Pure Tris solution is prone to microbial growth at room temperature, especially when the pH is close to neutral. It is recommended to perform high-pressure sterilization on the prepared buffer solution, treat it at 121 degrees Celsius for 20 minutes, cool it to room temperature after sterilization, and adjust the pH value according to experimental needs. The sterilized solution can be stored for weeks to months under sealed, room temperature, and dark conditions. If the buffer becomes turbid or flocculent, it indicates that it has been contaminated by microorganisms and should be re prepared. For electrophoresis buffer solutions such as TAE or TBE, solutions prepared with analytical grade Tris can be reused two to three times, but the electrophoresis effect may slightly decrease after each use. It is recommended to consider recycling when used for non critical samples.

Method selection for protein quantification

An easily overlooked characteristic of pure Tris analysis is that it contains free amino groups that react with certain protein quantification reagents. For example, when using the Bradford method to determine protein concentration, Tris will produce a background color, resulting in a higher measurement value. At this point, BCA or Lowry methods can be used instead, as these two methods are less affected by Tris interference. If laboratory conditions are limited and only the Bradford method can be used, the concentration of Tris in the buffer can be reduced, or Tris of the same concentration can be prepared as a blank control using standard samples for calibration.

What indicators should be considered during procurement

When purchasing and analyzing pure Tris, several indicators in the quality inspection report are worth paying attention to: purity, moisture content, heavy metal residue, and incineration residue. There are differences in these indicators among products of different brands, and it is more important to choose suppliers with good batch stability. In addition, packaging specifications also need to be considered. Laboratories with large quantities can choose packaging of 500g or 1kg to reduce single use costs.

Conclusion

Analytical pure Tris is a reliable basic reagent. By mastering temperature calibration, determining the applicable range, and correct storage methods, it can play a good buffering role in most routine experiments. For procurement and laboratory personnel, clarifying these usage conditions can also better evaluate the actual needs of the laboratory.

Product packaging

Tris 99% purity ensures the accuracy of results for scientific experiments, especially in fields that require high experimental requirements such as biochemistry and molecular biology. As a manufacturer of trihydroxymethylaminomethane, Desheng can supply more than 99% of raw material powders with stable performance and small batch differences, which is highly recognized by the market. If you have any relevant intentions, please click on the website to inquire about details and purchase!